Windows Defender - Windows 10 security delivers built-in & ongoing protections you can trust: Windows Defender Antivirus, firewall, family settings, ransomware protection, real-time protection & more. Stay up to date & protected at no extra cost.
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Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
Avast! Free Antivirus - Download Avast Free Antivirus on your Windows, Android, and Mac. World-leading antivirus, compatible with all Windows operating systems. Free forever!
Sophos Home - Business-grade cybersecurity for home users
Kaspersky Security Cloud - Kaspersky Security Cloud offers complete cloud based virus protection for PC, Mac, Android and iOS with hundreds of features - privacy, anti-ransomware, mobile security, password manager, vpn and parental control.